Four lens optical lens assembly having specified total Abbe number

Patent metadata

Field	Value
Publication number	US-11768351-B2
Application number	US-202117185987-A
Country	US
Kind code	B2
Filing date	Feb 26, 2021
Priority date	Nov 3, 2017
Publication date	Sep 26, 2023
Grant date	Sep 26, 2023

Abstract

An optical lens assembly is provided. The optical lens assembly includes first, second, third and fourth lens elements having refracting power arranged along an optical axis in a sequence from a light output side to a light input side. The first lens element is arranged to be a lens element in a fourth order from the light input side to the light output side. The second lens element is arranged to be a lens element in a third order from the light input side to the light output side. The third lens element is arranged to be a lens element in a second order from the light input side to the light output side. The fourth lens element is arranged to be a lens element in a first order from the light input side to the light output side.

First claim

What is claimed is:

1. An optical lens assembly, configured for a plurality of near infrared light beams emitted by a structured light generating unit having a plurality of light sources to pass through, a side facing the structured light generating unit having the light sources being a light input side, another side opposite thereto being a light output side, the optical lens assembly comprising a first lens element, a second lens element, a third lens element and a fourth lens element arranged along an optical axis in a sequence from the light output side to the light input side, each of the first lens element, the second lens element, the third lens element and the fourth lens element comprising a light output surface facing the light output side and a light input surface facing the light input side;
wherein
the light input side surface of the first lens element has a concave portion in a vicinity of a periphery of the first lens element,
the second lens element has negative refracting power,
the light input side surface of the third lens element has a concave portion in a vicinity of the optical axis,
wherein lens elements of the optical lens assembly are only the four lens elements described above and the optical lens assembly satisfies: V1+V2+V3+V4≤141, and V1 is an Abbe number of the first lens element, V2 is an Abbe number of the second lens element, V3 is an Abbe number of the third lens element, V4 is an Abbe number of the fourth lens element.

2. The optical lens assembly according to claim 1 , wherein the optical lens assembly further satisfies: (T1+G23)/(G12+G34)≤3.500, wherein T1 is a thickness of the first lens element along the optical axis, G12 is an air gap from the first lens element to the second lens element along the optical axis, G23 is an air gap from the second lens element to the third lens element along the optical axis, and G34 is an air gap from the third lens element to the fourth lens element along the optical axis.

3. The optical lens assembly according to claim 1 , wherein the optical lens assembly further satisfies: (T1+G23)/T2≤3.000, wherein T1 is a thickness of the first lens element along the optical axis, T2 is a thickness of the second lens element along the optical axis, and G23 is an air gap from the second lens element to the third lens element along the optical axis.

4. The optical lens assembly according to claim 1 , wherein the optical lens assembly further satisfies: EFL/ALT≤2.500, wherein EFL is an effective focal length of the optical lens assembly, and ALT is a sum of thicknesses of all of the lens elements having refracting power of the optical lens assembly along the optical axis.

5. The optical lens assembly according to claim 1 , wherein the optical lens assembly further satisfies: (G23+G34+T4)/(T2+T3)≤3.800, wherein T2 is a thickness of the second lens element along the optical axis, T3 is a thickness of the third lens element along the optical axis, T4 is a thickness of the fourth lens element along the optical axis, G23 is an air gap from the second lens element to the third lens element along the optical axis, and G34 is an air gap from the third lens element to the fourth lens element along the optical axis.

6. The optical lens assembly according to claim 1 , wherein the optical lens assembly further satisfies: (T1+G23+G34+T4)/(T2+T3)≤4.000, wherein T1 is a thickness of the first lens element along the optical axis, T2 is a thickness of the second lens element along the optical axis, T3 is a thickness of the third lens element along the optical axis, T4 is a thickness of the fourth lens element along the optical axis, G23 is an air gap from the second lens element to the third lens element along the optical axis, and G34 is an air gap from the third lens element to the fourth lens element along the optical axis.

7. The optical lens assembly according to claim 1 , wherein the optical lens assembly further satisfies: (LCR+T1)/(T3+T4)≤1.900, wherein T1 is a thickness of the first lens element along the optical axis, T3 is a thickness of the third lens element along the optical axis, T4 is a thickness of the fourth lens element along the optical axis, and LCR is a radius of a smallest circumcircle of the light emitting surface of the structured light generating unit having the light sources.

8. An optical lens assembly, configured for a plurality of near infrared light beams emitted by a structured light generating unit having a plurality of light sources to pass through, a side facing the structured light generating unit having the light sources being a light input side, another side opposite thereto being a light output side, the optical lens assembly comprising a first lens element, a second lens element, a third lens element and a fourth lens element arranged along an optical axis in a sequence from the light output side to the light input side, each of the first lens element, the second lens element, the third lens element and the fourth lens element comprising a light output surface facing the light output side and a light input surface facing the light input side;
wherein
the first lens element has positive refracting power and the light input side surface of the first lens element has a concave portion in a vicinity of a periphery of the first lens element,
the light input side surface of the third lens element has a concave portion in a vicinity of the optical axis,
the light output side surface of the fourth lens element has a concave portion in a vicinity of the optical axis,
wherein lens elements of the optical lens assembly are only the four lens elements described above and the optical lens assembly satisfies: V1+V2+V3+V4≤141, and V1 is an Abbe number of the first lens element, V2 is an Abbe number of the second lens element, V3 is an Abbe number of the third lens element, V4 is an Abbe number of the fourth lens element.

9. The optical lens assembly according to claim 8 , wherein the optical lens assembly further satisfies: (T1+T4)/T2≤3.600, wherein T1 is a thickness of the first lens element along the optical axis, T2 is a thickness of the second lens element along the optical axis, and T4 is a thickness of the fourth lens element along the optical axis.

10. The optical lens assembly according to claim 8 , wherein the optical lens assembly further satisfies: LCR/T2≤2.500, wherein T2 is a thickness of the second lens element along the optical axis, and LCR is a radius of a smallest circumcircle of the light emitting surface of the structured light generating unit having the light sources.

11. The optical lens assembly according to claim 8 , wherein the optical lens assembly further satisfies: TTL/(T2+T3)≤7.400, wherein T2 is a thickness of the second lens element along the optical axis, T3 is a thickness of the third lens element along the optical axis, and TTL is a distance from the light output surface of a lens element being a first piece having refracting power counted from the light output side to the structured light generating unit having the light sources along the optical axis.

12. The optical lens assembly according to claim 8 , wherein the optical lens assembly further satisfies: TL/ALT≤1.900, wherein TL is a distance from the light output surface of the first lens element to the light input surface of the fourth lens element, and ALT is a sum of thicknesses of all of the lens elements having refracting power of the optical lens assembly along the optical axis.

13. The optical lens assembly according to claim 8 , wherein the optical lens assembly further satisfies: (G34+T4)/T2≤3.500, wherein T2 is a thickness of the second lens element along the optical axis, T4 is a thickness of the fourth

Assignees

• Genius Electronic Optical Co Ltd

Inventors

• Gong Jinhui
• Cai Fensha
• Li Xue

Classifications

• G02B9/36 Primary

  arranged + -- + · CPC title

• G01B11/25

  by projecting a pattern, e.g. {one or more lines,} moiré fringes on the object (G01B11/255 takes precedence {; image analysis for depth or shape recovery G06T7/50}) · CPC title

• G02B13/0035

  having three lenses · CPC title

• G02B13/14 Primary

  for use with infrared or ultraviolet radiation ({G02B13/008, } G02B13/16 take precedence) · CPC title

• G02B13/16

  for use in conjunction with image converters or intensifiers {, or for use with projectors, e.g. objectives for projection TV} · CPC title